EP3838596A1 - Aus kohlefaserverbundmaterial hergestellter hülsenhalterzylinder für den flexodruck, versehen mit druckluftrohren mit geringem volumen für hülseneinsatz und zugehöriges herstellungsverfahren - Google Patents

Aus kohlefaserverbundmaterial hergestellter hülsenhalterzylinder für den flexodruck, versehen mit druckluftrohren mit geringem volumen für hülseneinsatz und zugehöriges herstellungsverfahren Download PDF

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Publication number
EP3838596A1
EP3838596A1 EP20215018.1A EP20215018A EP3838596A1 EP 3838596 A1 EP3838596 A1 EP 3838596A1 EP 20215018 A EP20215018 A EP 20215018A EP 3838596 A1 EP3838596 A1 EP 3838596A1
Authority
EP
European Patent Office
Prior art keywords
plate sleeve
holder cylinder
carbon
composite material
central tube
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP20215018.1A
Other languages
English (en)
French (fr)
Other versions
EP3838596B1 (de
Inventor
Christian VISINI
Marco PERANI
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Lamiflex SpA
Original Assignee
Lamiflex SpA
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Filing date
Publication date
Application filed by Lamiflex SpA filed Critical Lamiflex SpA
Publication of EP3838596A1 publication Critical patent/EP3838596A1/de
Application granted granted Critical
Publication of EP3838596B1 publication Critical patent/EP3838596B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F27/00—Devices for attaching printing elements or formes to supports
    • B41F27/10—Devices for attaching printing elements or formes to supports for attaching non-deformable curved printing formes to forme cylinders
    • B41F27/105—Devices for attaching printing elements or formes to supports for attaching non-deformable curved printing formes to forme cylinders for attaching cylindrical printing formes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F13/00—Common details of rotary presses or machines
    • B41F13/08—Cylinders
    • B41F13/10—Forme cylinders
    • B41F13/12—Registering devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F13/00—Common details of rotary presses or machines
    • B41F13/08—Cylinders
    • B41F13/10—Forme cylinders
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F27/00—Devices for attaching printing elements or formes to supports
    • B41F27/005—Attaching and registering printing formes to supports
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F5/00—Rotary letterpress machines
    • B41F5/24—Rotary letterpress machines for flexographic printing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41P—INDEXING SCHEME RELATING TO PRINTING, LINING MACHINES, TYPEWRITERS, AND TO STAMPS
    • B41P2200/00—Printing processes
    • B41P2200/10—Relief printing
    • B41P2200/12—Flexographic printing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41P—INDEXING SCHEME RELATING TO PRINTING, LINING MACHINES, TYPEWRITERS, AND TO STAMPS
    • B41P2227/00—Mounting or handling printing plates; Forming printing surfaces in situ
    • B41P2227/20—Means enabling or facilitating exchange of tubular printing or impression members, e.g. printing sleeves, blankets

Definitions

  • the present invention relates to a plate sleeve-holder cylinder used in a flexographic printing process.
  • the invention relates to a plate sleeve-holder cylinder for flexographic printing, whose central tube is made of carbon-fibre composite material, wherein low-volume pipes are provided for delivering compressed air onto the outer surface of the plate sleeve-holder cylinder, in view to ease sleeve insertion thereon.
  • the invention also relates to a preferred manufacturing process of said central tube made of carbon-fibre composite material.
  • a flexographic printing plate sleeve-holder cylinder of the type described above consists in fact of a central tube and two end flanges steadily joined thereto. Pins integral with said end flanges allow the plate sleeve-holder cylinder to be rotatably mounted on the flexographic printing machine.
  • all the elements above were made of steel and mutually assembled by means of press fit and/or welding techniques between the end flanges and the central tube.
  • central tubes have been partially replaced by central tubes made of carbon-fibre composite material - mainly with the purpose of reducing the moment of inertia, increasing the flexural rigidity, and obtaining more effective vibration dampening of the plate sleeve-holder cylinder.
  • the assembly of the two metallic end flanges equipped with rotation pins with the central tube made of carbon-fibre composite material is obtained by bonding through suitable adhesives said end flanges onto the inner wall of said central tube.
  • a high-pressure chamber is then formed inside the plate sleeve-holder cylinder, which high pressure applies both in the radial direction, i.e., onto the side wall of the central tube, and in the axial direction, i.e., onto the inner portions of the end flanges which close the opposite ends of the central tube.
  • This latter axial thrust therefore causes a high shear stress on the adhesive-bonded contact surface between the central tube and the end flanges.
  • the central tube thickness (which is quite high, in order to also satisfy the central tube mechanical requirements in terms of flexural rigidity) and the bonding length of the end flanges are sufficient to guarantee high safety coefficients with respect to the mechanical stresses caused by the compressed air chamber formed within the central tube.
  • occasional critical incidents have occurred - particularly when the flexographic plate sleeve-holder cylinders were used under conditions accidentally out of the project specifications - wherein sudden ejections of the metal flanges from the central tube made of composite material or even total breaks of the same central tube occurred, with the risk of serious consequences for the safety of the operators on the printing machine.
  • a plate sleeve-holder cylinder is provided, in addition to the usual central tube, with a coaxial inner tube which seals onto an inner shoulder of the end flanges, thus dividing the central tube inner volume into two chambers and forming the compressed air chamber only in the outer one, i.e., in the cylindrical gap between said central tube and said inner tube.
  • one or more compressed air circuits are inserted into the inner chamber R of a plate sleeve-holder cylinder, by means of metallic pipes A which run along the inner side wall of the central tube T made of composite material, and which frontally engage with the end flanges at respective inlet valves.
  • branch blocks B are arranged at regular intervals, bonded to the inner surface of the central tube T made of composite material, and communicating both with the outside through holes H formed in the side wall of said central tube T and with the respective pipe A. Compressed air introduced into pipes A from said inlet valves flows therefor out of the holes H provided along the central tube T, easing the sleeve insertion.
  • the technical problem addressed by the present invention is therefore that of providing a plate sleeve-holder cylinder for flexographic printing, with insertion of sleeves eased by compressed air jets, equipped with dedicated air circuits arranged along the plate sleeve-holder cylinder for the delivery of compressed air, wherein said air circuits should exclude the use of the inner chamber of the plate sleeve-holder cylinder and preferably be of simple construction and reliable in their operation over time.
  • a first object of the present invention is to associate said air circuits to the plate sleeve-holder cylinder structure itself, during its manufacturing process, to obtain a particularly sturdy and reliable structure for such air circuits.
  • a second object of the present invention is then to minimize the use of additional elements for the construction of said air circuits, in order to limit the increase in costs in the production of the plate sleeve-holder cylinder equipped with such air circuits.
  • the inventors conceived to embed low-volume air pipes for compressed air delivery within the thickness of the side wall of the central tube made of carbon-fibre composite material of a plate sleeve-holder cylinder for flexographic printing.
  • This innovative technical solution in addition to radically and effectively solving the safety problems exhibited by known plate sleeve-holder cylinders having an inner high-pressure chamber, also allows to considerably simplify the air pipe construction, meanwhile offering significantly higher reliability over time, with respect to the previously discussed prior art solution which discloses pipes positioned in the inner chamber of the plate sleeve-holder cylinder and attached to the side wall thereof.
  • the compressed air pipes according to the present invention are formed in the central tube made of composite material during the same lamination step thereof - carried out with "wrapping" or “filament winding” technologies or with a combination of the same - by embedding appropriate inserts or mandrels, which may be withdrawable after the resin polymerization, within the thickness of the side wall of said central tube, in order to create one or more straight longitudinal pipes having a desired section.
  • a preferred manufacturing process of a central tube made of carbon-fibre composite material according to the present invention wherein air pipes for compressed air delivery are embedded comprises the steps of:
  • step d) of formation of the air pipes 6 it is possible to use both removable metal mandrels 3 and disposable hollow inserts 4, intended to remain embedded in the structure of the central tube T made of carbon-fibres composite material during the lamination step.
  • the choice between these two solutions can be dictated by geometric constraints, needs of the technological process or requirements of the air flow requested in the air pipes 6, based on the specific model of plate sleeve-holder cylinder.
  • air pipes 6 thus formed within tube T made of composite material are finally connected to each other and to an external valve V for compressed air supply by means of air channels 7 machined inside a flange Fb forming the base end of the plate sleeve-holder cylinder.
  • a flange Fm which closes the opposite end of the plate sleeve-holder cylinder, i.e.
  • the end onto which sleeve insertion takes place is provided instead with a circular air channel 8 which connects the air pipes 6 between them and with a crown of radial vent holes K which allow that an uniform flow of compressed air springs from the outer edge of the flange Fm and therefore the required functionality of easing the initial insertion of the sleeves on the plate sleeve-holder cylinder is obtained.
  • Methods (coupling and adhesive bonding) for assembling the central tube T made of composite material and the metallic end flanges F must be therefore such as to ensure a perfect alignment between the air pipes 6 and the air channels 7 and 8 formed in the flanges Fb and Fm, and to ensure the relative air seal on frontal and cylindrical contact surfaces between these elements.
  • centring dowels are preferably used, engaged with corresponding centring holes provided on the flanges F, from one side, and then with the air pipes 6 formed in the central tube T made of composite material, from the other side. Said dowels are placed in position when bonding the flanges Fb and Fm to the central tube T and are then subsequently extracted from outside the flanges when the bonding adhesive is sufficiently polymerized. Residual holes remained on the flanges are then closed with corresponding plugs.
  • the plate sleeve-holder cylinder of the present invention has fully achieved the intended objects, as the compressed air pipes 6 are embedded within the same constituent elements of the plate sleeve-holder cylinder, without using additional or foreign elements. Said air pipe structure is therefore especially sturdy and reliable.
  • the plate sleeve-holder cylinder of the present invention also allows to achieve several operational advantages, which can be summarized as follows:

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Printing Plates And Materials Therefor (AREA)
EP20215018.1A 2019-12-19 2020-12-17 Aus kohlefaserverbundmaterial hergestellter hülsenhalterzylinder für den flexodruck, versehen mit druckluftrohren mit geringem volumen für hülseneinsatz und zugehöriges herstellungsverfahren Active EP3838596B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT102019000024820A IT201900024820A1 (it) 2019-12-19 2019-12-19 Cilindro porta maniche in materiale composito, a base di fibra di carbonio, munito di condotti a volume ridotto per l’aria compressa di inserimento maniche e relativo procedimento di fabbricazione

Publications (2)

Publication Number Publication Date
EP3838596A1 true EP3838596A1 (de) 2021-06-23
EP3838596B1 EP3838596B1 (de) 2022-10-19

Family

ID=70228493

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20215018.1A Active EP3838596B1 (de) 2019-12-19 2020-12-17 Aus kohlefaserverbundmaterial hergestellter hülsenhalterzylinder für den flexodruck, versehen mit druckluftrohren mit geringem volumen für hülseneinsatz und zugehöriges herstellungsverfahren

Country Status (4)

Country Link
US (1) US11559977B2 (de)
EP (1) EP3838596B1 (de)
ES (1) ES2935810T3 (de)
IT (1) IT201900024820A1 (de)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004050367A1 (en) 2002-12-03 2004-06-17 Day International, Inc. Gapless compressible print cylinder assembly
IT201800003066A1 (it) * 2018-02-27 2019-08-27 Futura Spa Rullo cliché per macchine da stampa.

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10008218B4 (de) * 2000-02-23 2006-10-05 Man Roland Druckmaschinen Ag Zylinder einer Rotationsdruckmaschine
DE202007011929U1 (de) * 2007-08-24 2007-10-25 Polywest Kunststofftechnik Saueressig & Partner Gmbh & Co. Kg Adapterhülse zur Aufnahme von Druckformen tragenden Arbeitshülsen sowie Vorrichtung für die Montage oder Demontage einer Druckformen tragenden Arbeitshülse auf oder von einer Adapterhülse

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004050367A1 (en) 2002-12-03 2004-06-17 Day International, Inc. Gapless compressible print cylinder assembly
EP1567341A1 (de) * 2002-12-03 2005-08-31 Day International, Inc. Spaltfreie, zusammendruckbare druckzylinderanordnung
IT201800003066A1 (it) * 2018-02-27 2019-08-27 Futura Spa Rullo cliché per macchine da stampa.

Also Published As

Publication number Publication date
US20210187936A1 (en) 2021-06-24
US11559977B2 (en) 2023-01-24
IT201900024820A1 (it) 2021-06-19
ES2935810T3 (es) 2023-03-10
EP3838596B1 (de) 2022-10-19

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